Electric fan



FIG. 1 is a front view thereof;

FIG. 2 is a left side view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a perspective view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a right side view of an electric fan. 

The ornamental design for electric fan, as shown and described. 